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20 April 2024 |
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Experimental Twin-Field Quantum Key Distribution Through Sending-or-Not-Sending | | Yang Liu
; Zong-Wen Yu
; Weijun Zhang
; Jian-Yu Guan
; Jiu-Peng Chen
; Chi Zhang
; Xiao-Long Hu
; Hao Li
; Teng-Yun Chen
; Lixing You
; Zhen Wang
; Xiang-Bin Wang
; Qiang Zhang
; Jian-Wei Pan
; | | Date: |
17 Feb 2019 | | Abstract: | Channel loss seems to be the most severe limitation to the application long
distance quantum key distribution in practice. The idea of twin-field quantum
key distribution can improve the key rate from the linear scale of channel loss
in the traditional decoy-state method to the square root scale of the channel
transmittance. However, the technical demanding is rather tough because it
requests high alignment precision in single-photon interference. Here we
demonstrate the real-optical-fiber experimental results of twin-field quantum
key distribution through the sending-or-not-sending protocol, which is fault
tolerant to large misalignment error. In the experiment, we use the phase
locking technology developed in the time and frequency metrology, to make sure
the wavelengths of Alice’s and Bob’s source are locked to each other and locked
to an ultra-stable cavity. The phase reference is then read out with a phase
reference pulse. Further with a single photon detector with high detection
rate, we obtain the key rates under 4 different distances, 0km, 50 km, 100km
and 150km, Especially, the obtained secure key rate at 150 km is higher than
that of the measurement device independent QKD. | | Source: | arXiv, 1902.6268 | | Services: | Forum | Review | PDF | Favorites | |
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